Patent US3622745A successfully refreshed from Google Patents.
US3622745A
Expired / Lapsed
US
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Thermal bonding means for electrographic apparatus
Assignee: STC PLC
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Filing: 1969-11-14
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Granted: 1971-11-23
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Expires: 1989-11-14
Abstract
Abstract Thermal bonding means with reduced power requirements for fixing powder particles to a web of paper in electrographic apparatus. The thermal bonding means utilize the direct application of infrared heat to the paper and in addition provide indirect heating by means which utilize the waste heat from the infrared application. The indirect means absorb the waste heat initially and reapply it so as to heat the paper and powder particles before and during the direct application of infrared heat.
Inventors
- 👤 Stanley Carden Shepard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:57
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2007
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
352 words
In apparatus of the type wherein charge patterns are formed on a recording surface and developed by charge attractable powder particles coated with a thermal fixing agent, and in which the powdered patterns are then transferred to a substrate surface, thermal bonding means for forming a permanent record of the charge patterns on the substrate surface, comprising first means for directly heating the powder pattern formed on the substrate surface, and second means which utilize heat radiated by said first means to indirectly heat the powder pattern before it is heated by said first means, said second means including fluidcirculating means, part of which forms a portion of said first means and the remainder of which is arranged to heat the powder pattern before it is heated by said first means and a fluid supply source connected to said fluid-circulating means, said fluid-circulating means having a lamp housing member having an extended portion with a pair of major surfaces such that one of the major surfaces of the extended portion is arranged adjacent to that part of the substrate surface which is subsequently heated by said first means, a first plurality of metal pipes to the other of the major surfaces of said extended portion and to a surface of said lamp housing member, a metal plate member having a pair of major surfaces one of which is situated adjacent to the one major surface of the extended portion of the lamp housing member in a manner such that a gap is provided therebetween, the length of said plate member being such that it extends at least along the same section of the substrate as said extended portion of the lamp housing member, and a second plurality of metal pipes connected to the other of the major surfaces of the plate member, wherein the bores of said first plurality of pipes are connected at one end thereof to one end of the bores of said second plurality of pipes, and wherein the other ends of said bores of said first and second plurality of pipes are connected to said fluid supply source.
Claim 2
Dependent Claim
352 words
In apparatus of the type wherein charge patterns are formed on a recording surface and developed by charge attractable powder particles coated with a thermal fixing agent, and in which the powdered patterns are then transferred to a substrate surface, thermal bonding means for forming a permanent record of the charge patterns on the substrate surface, comprising first means for directly heating the powder pattern formed on the substrate surface, and second means which utilize heat radiated by said first means to indirectly heat the powder pattern before it is heated by said first means, said second means including fluidcirculating means, part of which forms a portion of said first means and the remainder of which is arranged to heat the powder pattern before it is heated by said first means and a fluid supply source connected to said fluid-circulating means, said fluid-circulating means having a lamp housing member having an extended portion with a pair of major surfaces such that one of the major surfaces of the extended portion is arranged adjacent to that part of the substrate surface which is subsequently heated by said first means, a first plurality of metal pipes to the other of the major surfaces of said extended portion and to a surface of said lamp housing member, a metal plate member having a pair of major surfaces one of which is situated adjacent to the one major surface of the extended portion of the lamp housing member in a manner such that a gap is provided therebetween, the length of said plate member being such that it extends at least along the same section of the substrate as said extended portion of the lamp housing member, and a second plurality of metal pipes connected to the other of the major surfaces of the plate member, wherein the bores of said first plurality of pipes are connected at one end thereof to one end of the bores of said second plurality of pipes, and wherein the other ends of said bores of said first and second plurality of pipes are connected to said fluid supply source.
Claim 3
Dependent Claim
186 words
In apparatus of the type wherein charge patterns are formed on a recording surface and developed by charge attractable powder particles coated with a thermal fixing agent, and in which the powdered patterns are then transferred to a substrate surface, thermal bonding means for forming a permanent record of the charge patterns on the substrate surface comprising first means for directly heating the powder pattern on the substrate surface including at least one elongated radiant heating element, and second means for absorbing the waste heat generated by said first means and applying said absorbed heat to the substrate prior to the application of said direct heat to like portions of the substrate, said second means including a housing substantially forming with said substrate an enclosure around said heating element, and a heating plate section physically and thermally connected to said housing in front thereof in the direction of travel of the substrate, said heating plate section being arranged to be in contact with the substrate in order to impart thereto the absorbed waste heat from said first means by way of conduction in the preheating mode.
Claim 4
Dependent Claim
186 words
In apparatus of the type wherein charge patterns are formed on a recording surface and developed by charge attractable powder particles coated with a thermal fixing agent, and in which the powdered patterns are then transferred to a substrate surface, thermal bonding means for forming a permanent record of the charge patterns on the substrate surface comprising first means for directly heating the powder pattern on the substrate surface including at least one elongated radiant heating element, and second means for absorbing the waste heat generated by said first means and applying said absorbed heat to the substrate prior to the application of said direct heat to like portions of the substrate, said second means including a housing substantially forming with said substrate an enclosure around said heating element, and a heating plate section physically and thermally connected to said housing in front thereof in the direction of travel of the substrate, said heating plate section being arranged to be in contact with the substrate in order to impart thereto the absorbed waste heat from said first means by way of conduction in the preheating mode.
Claim 5
Dependent Claim
26 words
The arrangement according to claim 2 wherein said second means heat the powder pattern before and during the time it is heated by said first means.
Claim 6
Dependent Claim
33 words
The arrangement according to claim 2 wherein said first means include a source of infrared heat and said second means include fluid-circulating means, part of which forms a portion of said first means.
Claim 7
Dependent Claim
42 words
The arrangement according to claim 2 wherein the source of infrared heat includes at least one infrared lamp enclosed within a metallic housing member having a reflecting inner surface, and means for connecting a source of electrical supply to said infrared lamp.
Claim 8
Dependent Claim
53 words
The arrangement according to claim 15 wherein said second means include fluid-circulating means, part of which forms a portion of said first means and the remainder of which is arranged to heat the powder pattern before it is heated by said first means, and a fluid supply source connected to said fluid-circulating means.
Claim 9
Dependent Claim
182 words
The arrangement according to claim 6 wherein said part of the fluid-circulating means includes a hollow lamp housing member and said remainder of the fluid-circulating means is an extension of said hollow lamp housing member such that a major surface of the extended hollow part is arranged to be adjacent to and to effect the heating of that part of the substrate surface which is subsequently heated by said first means, wherein said remainder of the fluid-circulating means further includes a second hollow member a major surface of which is situated adjacent to said major surface of the extended hollow part of said hollow lamp housing member in a manner such that a gap is provided therebetween, said second hollow member being positioned to at least heat the same section of the substrate as said extended hollow part of said hollow lamp housing member and connected at one end to said extended part of said hollow lamp housing member, and wherein said fluid supply source is connected between the other end of said second hollow member and said hollow lamp housing member.
Claim 10
Dependent Claim
217 words
The arrangement according to claim 6 wherein said fluid-circulating means include lamp housing member having an extended portion with a pair of major surfaces such that one of the major surfaces of the extended portion is arranged adjacent to that part of the substrate surface which is subsequently heated by said first means, a first plurality of metal pipes to the other of the major surfaces of said extended portion and to a surface of said lamp housing member, a metal plate member having a pair of major surfaces one of which is situated adjacent to the one major surface of the extended portion of the lamp housing member in a manner such that a gap is provided therebetween, the length of said plate member being such that it extends at least along the same section of the substrate as said extended portion of the lamp housing member, and a second plurality of metal pipes connected to the other of the major surfaces of the plate member, wherein the bores of said first plurality of pipes are connected at one end thereof to one end of the bores of said second plurality of pipes, and wherein the other ends of said bores of said first and second plurality of pipes are connected to said fluid supply source.
Claim 11
Dependent Claim
53 words
The arrangement according to claim 7 wherein said fluid supply source includes a reservoir of fluid, the inlet of which is connected to said fluid-circulating means, and a fluid pump, the input side of which is connected to the reservoir outlet and the output side of which is connected to said fluid-circulating means.
Claim 12
Dependent Claim
15 words
The arrangement according to claim 9 wherein a heater unit is provided in said reservoir.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |